Opera Sync - remove devices

how can I remove devices on my PC? A installed Opera Mini on Android and then uninstalled it and installed Opera for Android and now I have the first device like it's still active and when I use Opera on Android the second device also appears. I don't want to have two devices if it's the same device. On Android I removed unwanted devices but on PC I can't find a solution.

This will be awesome. I tried the beta version of Opera on a couple systems and now they show twice in the devices section (once for the stable install and once for the beta install). Being able to delete the no-longer-used beta listings would be very helpful.

You can delete devices, but beware - if you delete the folder for a device that has Sync active the next time that device is synced all of its speed dials will be removed. Best is to deactivate Sync on the device first, then just go ahead and delete the device folder(s). (Even if the device is gone, Opera will warn you on each folder about deleting device folders.)

sgunhouse, sorry, I can't understand which folders do you mean. But thank you for answer anyway!
In my case I'm interested in deleting openned tabs information from Opera Sync server for the specific old device. Do you suggest booting this old device up, then closing all openned tabs in Opera Mini and then deactivating sync in device's settings?

I ask because I tried to close some tabs on this device but they didn't disappear from Opera Sync page (I tried to reload this page on pc several minutes after, closed tabs were still shown).